Bungie and MS have been created an extensive background and campaign centered around the ODSTs (Orbital Drop Shock Trooper). We may be finding that the comics (Helljumper), the commercials (We Are ODST), and the homepage (xbox.com/halo) will tie together stories surrounding troops of the 105th Division - the Helljumpers.

Not only that, but Halo 3: ODST will also contain an entire sub-story called Sadie's Story, created by an independent company spawned from 42 Entertainment (creators of I Love Bees, for Halo 2) called Fourth Wall Studios (fourthwallstudios.com)

Below is a brief status rundown of marketing/ARGish events leading up to (and perhaps beyond) the release of Halo 3: ODST.

We Are ODST

Sept 4, 2009, the ODST live action short We Are ODST (1:32 in length) is released to the public by IGN, where we learn of a number of marines, including:

Sept 7, 2009, Spike TV airs the extended version of We Are ODST (2:34 in length), paired with the revelation of the updated Halo homepage (xbox.com/halo) containing a deeper look at three ODST troops, and some hidden content.

This video discusses the use of explosives on archaeological dig sites... this would indicate that ONI may have found the presence of the long-range gateway linking Earth to The Ark or its connecting facilities underground; prior to the Covenant's arrival in orbit, or whilst Prophet Regret sent troops down to New Mombasa.